553 Relaying disallowed PROBLEM

553 Relaying disallowed PROBLEM

Hi, i host here nextgaming.eu (as email hosting)

i reconfigured my email account recently , but when i try to send from my @gmail.com account to kekko@nextgaming.eu i receive the following error:

Risposta:

553 Relaying disallowed


Final-Recipient: rfc822; kekko@nextgaming.eu
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx.zoho.eu. (31.186.226.32, the server for the domain nextgaming.eu.)
Diagnostic-Code: smtp; 553 Relaying disallowed
Last-Attempt-Date: Tue, 12 Sep 2017 01:17:21 -0700 (PDT)

but if i try to send an email from kekko@nextgaming.eu to my @gmail.com account the email arrive immediately?

What i can do now? i tryed to change mx record from .eu to .com but without success

Thanks for any help